non-turbo cars still require a decent amount of back pressure.
people think they are doing their NA car good when they throw 2.5"+ exhaust tubing on thier car, and a bigass 4" muffler.
all thats going to do is lose you power. Your suppose to just upgrade slightly from stock if your going NA as opposed to turbo, because to much airflow causes a loss of power, if you stay around the 2" range, there will be no harm, because unless you go any smaller than stock, your still garunteed your standard horsepower
oh i have alot of exhaust work on my new b. from the header back it is 2.5 to the spipe that is not mandrel bent so it has some tights spots. to the resonator it is 2.5 after the resonator its like 1.75 on. the only stock piece of pipe i have on my car is the rear spipe or cross over pipe. i left it for some back pressure in the mean time till the turbo gets slapped on. here is how it sounds with a high flow cat inplace of the resonator, and a trd axle back with the strup header.
Im KITTENJAMES biznatch don't forget it
mmmmm E85 tearing up eyes since july 09 C&C tuning We make ____ fast http://www.youtube.com/watch?v=DbIOr7EewbA
we roll deep best et 12.8 at 115mph
and if you dont order parts from this guy Chuck Norris will make you his working girl WWW.Nurspec.COM
::sigh:: im not going to sit here and argue with you.
Ive been a performance tech for coming up on 3yrs now, so atleast in the end i know what im talkin about.
well if you let me explain what i have under the car i wouldnt be arguing i have 2.5" from s-pipe to axle back with 2 resonators about 1' long each and they are 2.5" inlet and outlet and they build back pressure so i dont see a big hp gain or loss
NEED SOMETHING INSTALLED JUST ASK (AKA)CHRIS-GARAGE
i can hook it up with SNAP-ON tools
hope this helps with some of the debate. seeing that this engine has VVT and constant fuel monitoring, some of the issues won't apply. lets keep it friendly. we're all driving the same car and want insight from others to make it that much better for the individual driver.